Which of the following metals is commercially reduced by the carbon reduction method and refined by the distillation method?

The Gibbs energy vs $T$ plot for the formation of oxides is given below:
For the given diagram,the correct statement is-

Statement $(A)$ $Mg$ can reduce $Al_2O_3$ above $1350^{\circ} C$.
Statement $(B)$ $Al$ can reduce $MgO$ below $1350^{\circ} C$.
The correct answer is

Predict the physical state of the metal $M$ obtained in the following reduction reaction shown by the Ellingham diagram: $MO(s) + C(s) \rightarrow M(?) + CO(g)$.

Assertion : Copper obtained after $Bessemerization$ is known as blister copper.
Reason : Blisters are produced on the surface of the metal due to escaping of dissolved $SO_2$.

Which statement is incorrect regarding the Hall-Heroult process for the metallurgy of aluminium?
$1$. Use of $Na_3AlF_6$ lowers the melting point of $Al_2O_3$.
$2$. Steel vessel with a lining of carbon acts as the cathode.
$3$. Graphite is used as the anode.
$4$. Carbon dioxide gas is generated at the cathode.